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  1. #1
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    sight glass location



    with refrigerants that are blends [4 series] where in the liquid line on a average system with a pipe run of say 5 metres should you locate it because i have different opinions from my other engineer friends?



  2. #2
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    Re: sight glass location

    Quote Originally Posted by cadwaladr View Post
    with refrigerants that are blends [4 series] where in the liquid line on a average system with a pipe run of say 5 metres should you locate it because i have different opinions from my other engineer friends?
    You should ask your self, what is the sight glass used for? moisture indicator and refrigerant flow.
    As far as system charge goes it is an "aid" to charging and not a method.
    What do you "not" want see in the sight glass, and why?
    Answer the why, and this will give you the correct position. (and it is not where every body mounts them!!!)

  3. #3
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    Re: sight glass location

    You can use a few sight glasses, after the drier will help you know when it is starting getting blocked. Just before the TXV will help you know if it fed with liquid.

    On oil return line, will indicate flow of oil back to the sump.

  4. #4
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    Re: sight glass location

    normally there by the condenser so the muppet bomb charging it can see a full sight glass. but they should be located at he tev inlet to ensure no flash gas in the liq line prior to the tev

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    Re: sight glass location

    Quote Originally Posted by install monkey View Post
    normally there by the condenser so the muppet bomb charging it can see a full sight glass. but they should be located at he tev inlet to ensure no flash gas in the liq line prior to the tev
    And give this dog a bone! or should I say give this monkey a banana

  6. #6
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    Re: sight glass location

    yay!-if only i could have a rep point haha

  7. #7
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    Re: sight glass location

    Chemi was first ;-)
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  8. #8
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    Re: sight glass location

    But he wasn't say about location before solenoid or after
    In some places will have to think ...

  9. #9
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    Re: sight glass location

    Quote Originally Posted by Aik View Post
    But he wasn't say about location before solenoid or after
    Considering the solenoid is just near the TEV I would put it after the solenoid (between the solenoid and the TEV), as this one also create a pressure drop 0,4...1 bar, more or less.

    As mad fridgie said at the first email unfortunately many people don't apply the sight glass on this place. I try to fight that but it's not easy.
    To make progress is never good enough, I want to do better and better and better

  10. #10
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    Re: sight glass location

    Quote Originally Posted by Aik View Post
    But he wasn't say about location before solenoid or after
    Half a banana then
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  11. #11
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    Re: sight glass location

    I prefer put sight glass after filter but before solenoid.

    As mad fridgie said at the first email unfortunately many people don't apply the sight glass on this place.
    I also don't put it at that place, only if I have problems with liquid refrigerant circulation, but it's infrequent cases.

    Half a banana then
    In some places will have to think ...

  12. #12
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    Re: sight glass location

    Quote Originally Posted by Sandro Baptista View Post
    Considering the solenoid is just near the TEV I would put it after the solenoid (between the solenoid and the TEV), as this one also create a pressure drop 0,4...1 bar, more or less...
    I should say 0.15 bar is more commonly. If you have 1 bar, then your SV was undersized
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  13. #13
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    Re: sight glass location

    I should say 0.15 bar is more commonly.
    Yeah, you are right. For example danfoss (servo) solenoid needs minimum 0.05 bar to work well... 1 bar is to much
    In some places will have to think ...

  14. #14
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    Re: sight glass location

    Quote Originally Posted by Peter_1 View Post
    I should say 0.15 bar is more commonly. If you have 1 bar, then your SV was undersized
    Sorry, you are right. I meant 0,04...0,1 bar.
    To make progress is never good enough, I want to do better and better and better

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